CN102807512A - Method for producing 2-naphthol 6,8 potassium hydrazinodisulfonate by partial circulation of mother liquor - Google Patents
Method for producing 2-naphthol 6,8 potassium hydrazinodisulfonate by partial circulation of mother liquor Download PDFInfo
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- CN102807512A CN102807512A CN2012102814310A CN201210281431A CN102807512A CN 102807512 A CN102807512 A CN 102807512A CN 2012102814310 A CN2012102814310 A CN 2012102814310A CN 201210281431 A CN201210281431 A CN 201210281431A CN 102807512 A CN102807512 A CN 102807512A
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- mother liquor
- disulfonic acid
- naphthol
- beta naphthal
- potassium
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Abstract
The invention relates to a method for producing 2-naphthol 6,8 potassium hydrazinodisulfonate by partial circulation of mother liquor. The method comprises the following steps: 1, dissolving 2-naphthol into fuming sulphuric acid for reacting for 2-5 hours to obtain 2-naphthol 6,8 disulfonic acid; 2, enabling 2-naphthol 6,8 disulfonic acid to react with potassium chloride to generate 2-naphthol 6,8 potassium hydrazinodisulfonate; 3, separating 2-naphthol 6,8 potassium hydrazinodisulfonate from the mother liquor to obtain the solid 2-naphthol 6,8 potassium hydrazinodisulfonate and the mother liquor, and 4, subjecting the mother liquor to low-temperature crystallization and absorptive decolorization, adding potassium chloride, and preparing salt solution for being used in the second step.
Description
The method of mother liquor part cyclic production beta naphthal 6,8 disulfonic acid potassiums of the present invention belongs to chemical field, relates to the preparation of fine chemicals, is a kind of method of mother liquor part cyclic production beta naphthal 6,8 disulfonic acid potassiums specifically.
Beta naphthal 6,8 disulfonic acid potassiums are commonly called as G salt, are a kind of fine chemicals, can be used for preparing dyestuff, medicine, agricultural chemicals etc.In the method for traditional production beta naphthal 6,8 disulfonic acid potassiums, the preparation of salts solution is a water dissolving Repone K, and the mother liquor that the back of saltouing produces directly enters Sewage treatment systems, has so not only increased the process water amount, has also strengthened the processing load of waste water simultaneously.
The object of the present invention is to provide a kind of method of mother liquor part cyclic production beta naphthal 6,8 disulfonic acid potassiums.
The object of the invention can be realized through following steps:
(1) method of mother liquor part cyclic production beta naphthal 6,8 disulfonic acid potassiums of the present invention is to be raw material with the beta naphthal, at first beta naphthal is dissolved in the oleum under 20-35 ℃; Be heated to 50-100 ℃ of reaction 2-5 hour then; Obtain beta naphthal 6,8 disulfonic acid, the chemical formula of this reaction is following:
(2) with above-mentioned product beta naphthal 6,8 disulfonic acid and Repone K reaction, generate beta naphthal 6,8 disulfonic acid potassiums, be reflected under 30-95 ℃ and carry out, the chemical formula of this reaction is following:
(3) above-mentioned product centrifuging is obtained solid beta naphthal 6,8 disulfonic acid potassiums and mother liquor respectively.
(4) above-mentioned mother liquor is added Repone K behind low temperature crystallization, adsorption bleaching, process salts solution and be used for above-mentioned steps (2).
Advantage of the present invention:
1, the mother liquor that produces in the production partly circulates and is used to prepare salts solution, has reduced process water, has also reduced the discharging of waste liquid amount simultaneously, has alleviated the liquid waste disposal load;
2, after the Recycling Mother Solution, owing to contain a certain amount of sylvite in the mother liquor, so can reduce the consumption of Repone K;
3, after the Recycling Mother Solution,, can suppress the carrying out of side reaction in theory, reduce the generation of by product, and then improve product yield, reduce raw material consumption owing to contain a certain amount of R salt and Xue Fo hydrochlorate in the mother liquor.
Further detail through embodiment below:
Produce 1000 tons of 2-naphthylamines 6,8 disulfonic acid production equipments per year, at first beta naphthal is melted in the oleum under 20-35 ℃, be heated to 50-100 ℃ of reaction 2-5 hour then, obtain beta naphthal 6,8 disulfonic acid; With above-mentioned product beta naphthal 6,8 disulfonic acid and Repone K reaction, generate beta naphthal 6,8 disulfonic acid potassiums then, be reflected under 30-95 ℃ and carry out; The 3rd step separated above-mentioned product beta naphthal 6,8 disulfonic acid potassiums with mother liquor, obtain solid beta naphthal 6,8 disulfonic acid potassiums; The 4th step added Repone K with above-mentioned mother liquor behind low temperature crystallization, adsorption bleaching, process salts solution and be used for above-mentioned steps (2).
Claims (1)
1. the method for mother liquor part cyclic production beta naphthal 6,8 disulfonic acid potassiums, it is characterized in that: (1) at first is dissolved in beta naphthal in the oleum under 20-35 ℃, is heated to 50-100 ℃ of reaction 2-5 hour then, obtains beta naphthal 6,8 disulfonic acid;
(2) with above-mentioned product beta naphthal 6,8 disulfonic acid and Repone K reaction, generate beta naphthal 6,8 disulfonic acid potassiums, be reflected under 30-95 ℃ and carry out;
(3) above-mentioned product centrifuging is obtained solid beta naphthal 6,8 disulfonic acid potassiums and mother liquor respectively.
(4) above-mentioned mother liquor is added Repone K behind low temperature crystallization, adsorption bleaching, process salts solution and be used for above-mentioned steps (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102814310A CN102807512A (en) | 2012-08-02 | 2012-08-02 | Method for producing 2-naphthol 6,8 potassium hydrazinodisulfonate by partial circulation of mother liquor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102814310A CN102807512A (en) | 2012-08-02 | 2012-08-02 | Method for producing 2-naphthol 6,8 potassium hydrazinodisulfonate by partial circulation of mother liquor |
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| CN102807512A true CN102807512A (en) | 2012-12-05 |
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| CN2012102814310A Pending CN102807512A (en) | 2012-08-02 | 2012-08-02 | Method for producing 2-naphthol 6,8 potassium hydrazinodisulfonate by partial circulation of mother liquor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106831500A (en) * | 2017-01-19 | 2017-06-13 | 南通海之阳膜化工有限公司 | A kind of preparation method of G salt and its accessory substance R salt |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295585A (en) * | 2011-06-21 | 2011-12-28 | 李安民 | Preparation method of 2-naphthylamine 6,8 disulfonic acid |
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2012
- 2012-08-02 CN CN2012102814310A patent/CN102807512A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295585A (en) * | 2011-06-21 | 2011-12-28 | 李安民 | Preparation method of 2-naphthylamine 6,8 disulfonic acid |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106831500A (en) * | 2017-01-19 | 2017-06-13 | 南通海之阳膜化工有限公司 | A kind of preparation method of G salt and its accessory substance R salt |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20121205 |